d/changelog: Remove trailing whitespaces

debian/changelog

+python-py-zipkin (0.15.0-2) UNRELEASED; urgency=medium
+
+  * d/changelog: Remove trailing whitespaces.
+
+ -- Ondřej Nový <onovy@debian.org>  Wed, 09 Jan 2019 13:44:34 +0100
+
 python-py-zipkin (0.15.0-1) unstable; urgency=medium
 
   [ Ondřej Nový ]
@@ -5,7 +11,7 @@ python-py-zipkin (0.15.0-1) unstable; urgency=medium
   * d/copyright: Use https protocol in Format field
 
   [ Olivier Sallou ]
-  * New upstream release 
+  * New upstream release
 
  -- Olivier Sallou <osallou@debian.org>  Thu, 25 Oct 2018 09:41:16 +0000